add sync-missing-metadata command with docs, resolves #25

tubesync/sync/management/commands/sync-missing-metadata.py

@@ -0,0 +1,34 @@
+import os
+from shutil import copyfile
+from django.core.management.base import BaseCommand, CommandError
+from django.db.models import Q
+from common.logger import log
+from sync.models import Source, Media
+from sync.utils import write_text_file
+
+
+class Command(BaseCommand):
+
+    help = 'Syncs missing metadata (such as nfo files) if source settings are updated'
+
+    def handle(self, *args, **options):
+        log.info('Syncing missing metadata...')
+        sources = Source.objects.filter(Q(copy_thumbnails=True) | Q(write_nfo=True))
+        for source in sources.order_by('name'):
+            log.info(f'Finding media for source: {source}')
+            for item in Media.objects.filter(source=source, downloaded=True):
+                log.info(f'Checking media for missing metadata: {source} / {item}')
+                thumbpath = item.thumbpath
+                if not thumbpath.is_file():
+                    if item.thumb:
+                        log.info(f'Copying missing thumbnail from: {item.thumb.path} '
+                                 f'to: {thumbpath}')
+                        copyfile(item.thumb.path, thumbpath)
+                    else:
+                        log.error(f'Tried to copy missing thumbnail for {item} but '
+                                  f'the thumbnail has not been downloaded')
+                nfopath = item.nfopath
+                if not nfopath.is_file():
+                    log.info(f'Writing missing NFO file: {nfopath}')
+                    write_text_file(nfopath, item.nfoxml)
+        log.info('Done')